chore: relocate owl bot post processor (#255)

chore: relocate owl bot post processor

Author: SurferJeffAtGoogle

packages/google-cloud-python-speech/.github/.OwlBot.yaml

@@ -13,7 +13,7 @@
 # limitations under the License.
 
 docker:
-  image: gcr.io/repo-automation-bots/owlbot-python:latest
+  image: gcr.io/cloud-devrel-public-resources/owlbot-python:latest
 
 deep-remove-regex:
   - /owl-bot-staging